Soil Stiffness Assessment of Stabilized Pavement Foundations

摘要

The quality of constructed pavement foundation layers was studied using rapid and nearcontinuoussoil stiffness measurements as alternatives to traditional nuclear gaugemoisture/density measurements. Sixteen different stabilized pavement foundation sectionscovering 4.8 miles were studied with ground conditions ranging from soft to very stiff.Measurements from falling weight deflectometer, light weight deflectometer, dynamic conepenetrometer, and roller-integrated compaction monitoring systems were used to assess soilstiffness. Statistical analyses of the results are reported in the form of coefficient of variation andempirical correlations between measurements. Results of soil stiffness were compared to twoindependent groups of nuclear moisture/density measurements to demonstrate some of theshortcomings of traditional nuclear gauge testing for quality assessment. The findings from thispaper show the value in characterizing ground variations using soil stiffness measurements. Costdata is also reported for the stabilized sections.